* {
    margin: 0;
    padding: 0;
}

.box1 {
    width: 1200px;
    height: 600px;
    margin: 50px auto;
    overflow: hidden;
    position: relative;
}

.box2 {
    width: 6000px;
    height: 600px;
    transition: margin-left .5s
}

.box3 {
    width: 1200px;
    height: 600px;
    float: left;
}

.box3 img {
    width: 100%;
    height: 100%;
}

.left {
    left: 0;
}

.btn {
    position: absolute;
    top: 50%;
    width: 60px;
    height: 220px;
    margin-top: -110px;
    background: rgba(0, 0, 0, .3);
    border: 0;
    font-size: 36px;
}

.right {
    right: 0;

}

.pagation {
    position: absolute;
    bottom: 20px;
    width: 100%;
    text-align: center;
}

.pagation li {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: #fff;
    display: inline-block;
    margin-left: 10px;
}

.pagation li.active {
    background: red;
}